Wiktionary
unring
vb. To reverse ringing
Usage examples of "unring".
What the hell – whaddaya say we stop trying to unring the bell and have fun with this thing?
Like trying to unring a bell, Chakotay couldn't ignore that real possibility, now that he'd thought of it.
By afternoon he had a couple more books, this time about sexual dysfunction, and read intently until he fell asleep by the still unringing phone, the fifth of his abject apologies and pleadings still unanswered on her voice mail.
The bell couldn't be unrung, and once they had made love they couldn't go back to a chaste relationship.